Answer:
Step-by-step explanation:
3x +2y = 13 -----------------(i)
x + 2y = 7 ----------------(ii)
Multiply the equation (ii) by (-1) and then add.
(i) 3x + 2y = 13
(ii)*(-1) <u>-x - 2y = -7 </u> {Now, add and y will be eliminated}
2x = 6
x = 6/2
x = 3
Plug in x = 3 in equation (i)
3*3 + 2y = 13
9 + 2y = 13
2y= 13 - 9
2y = 4
y = 4/2
y = 2
Answer: D
Step-by-step explanation:
14.29 percent probability or 2 out of 14. Dependent variable.
Answer:
The length of the ladder is 7.21 feet
Step-by-step explanation:
Let
y = Height of the wall
x = Distance between the wall and the ladder (bottom)
L = Length of the ladder
So, the given parameters are:

When 
The ladder, the wall and the ground forms a right-angled triangle where the hypotenuse is the length of the ladder; So:

Differentiate with respect to time

The length of the ladder does not change with time. So:


Rewrite as:

Divide both sides by 2

Recall that:
and 
So:




Substitute
and
in: 



